Top shell for helmet



FIG. 1 is a perspective view of a top shell of a helmet showing our new design, in a used condition with a helmet shown in broken lines;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a back perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a top view thereof; and,

FIG. 9 is a bottom view thereof.

The broken lines shown in the drawings represent portions of the top shell for helmet that form no part of the claimed design. 

CLAIM The ornamental design for a top shell of a helmet, as shown and described. 